Why does adding more borax to slime make it firmer?

[mirandasatterley]

[SOLVED] Cross-linking polymers

Homework Statement

What changes in consistency (if any) do you expect when adding more borax solution to your slime? Why?

Homework Equations

None

The Attempt at a Solution

Slime is a cross-linked polymer.
Borax (borate ion) is the cross-link.
So if more of the borax solution is added, then the slime will become more cross linked and therefore more solid and less pliable.

Is this correct?

 

[chemisttree]

That sounds right.